Author: Vincent Diepeveen
Date: 16:50:15 12/05/99
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On December 04, 1999 at 22:09:41, Eelco de Groot wrote: >Steve: >Do I understand correctly--for each static evaluation of a single position (leaf >node, I guess), the program evaluates based on material and positional factors >without regard to which side is on the move? Then, some programmers like to add >a bonus for the side to move? > >Vincent: >It's an heuristic that's true in 99% of the positions that my program >searches obviously. > >If a position is bad then usual programs nullmove. If a program nullmoves >then the other side has the move so gets the bonus. > >So the sword cuts on 2 sides. Where you can nullmove normally to prevent >getting into a worse position, you now suddenly cannot as your opponent >gets the bonus instead of you. > > >Me: >Now I have never done any chessprogramming, but it seems fairly straightforward >to say that you only need to think about such a bonus if you are comparing >positions with White to move and positions with Black to move, right? >Intuitively something tells me that is not without dangers. Isn't that a lot >like comparing apples and pears? Wouldn't it be a lot better if only even plies >were evaluated if possible? A recent discussion between Ed and Christophe about >the early Rebel comes to mind... That way you can focus much more on plans , >weaknesses, etc. of your own. You could save a lot of time time that way! Of >course you can't ignore the opponent regardless, but you could use a different >evaluation for uneven plies, looking more for tactical threats for instance? >That would be relatively safe to do as long as you have the initiative.. > >If this isn't possible because of nullmove, isn't that a weakness of normal >nullmove? Vincent I understand you are working on something you call double >nullmove and that you are going to publish in ICCA journal about it. Has this >anything to do with these even/uneven effects. Has double nullmove replaced the >bonus in Diep? I must confess nullmove is hardly my expertise, but maybe others >can follow better if you have anything to say about this. > >Thanks for any comments, by anybody Having a passed pawn can be seen as a risky bonus too. It might be hung! >Eelco
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